Among blacklisted tags, the numbers in this one reduce quickest. One contributing factor was bumping several old questions - Apologies re image links update => bumping. At least in some cases also the blacklisted tags were removed when the question was bumped.

And I have mentioned before that also François G. Dorais contributed largely to this decrease.

If we only count questions tagged (geometry) which do not have any top-level tag, then there are 148 such questions.

If we count question with the tag geometry but non of the most frequent geometry-related top-level tags, there are 247 such questions.